[jetty-user] Jetty http thread pool limitation

Jetty - V7.1.6

I have the following

jetty.threadpool.max = 50
jetty.http.acceptors = 4

I run my application and subject it under some load. I have a JMX bean
for " org.eclipse.jetty.util.thread.QueuedThreadPool" and I keep
refreshing it every 2 seconds.

I do observe that the "threads" is always between 30-45 and the
idleThreads is between 25-40. Alarmingly the difference between the
"threads" and "idleThreads" always seems to be 5.

This suggests to me that although I have four acceptors for accepting
http based traffic and I have a thread pool of 50 threads there is
definitely something else that is limiting the ability to serve
requests and it is only 5 max. There is noticeable degradation in that
after ramping up a few users the system becomes unresponsive.

Can someone shed some light on what could possibly be happening?

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